au_set_lr_value
static int au_set_lr_value(struct audio_softc *, mixer_ctrl_t *, int, int);
error = au_set_lr_value(sc, &ct, l, r);
error = au_set_lr_value(sc, &ct, l, r);
au_set_lr_value(sc, &ct, l, r))
au_set_lr_value(sc, &ct, l, r) == 0)